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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1027e23009af0b11c66ad85ebe76a9d5255db443acf226c911699183df2de72e' 
  AND token = 'Qsbd4oX/k17cCJvJLeMz4UB2cKW/Dx9Pr/dEdt/19hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}