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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f918e7acdd66d712e0519b5ca4e0dae49779c8f168d9b4208484f2843b0575' 
  AND token = '+jFJVKbV8paS4unBDbSUtB9x6M9KphhF7Qe1mx8QJbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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