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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41752753a9bd4aa5b3a931a185e2c706d317fff7052b5a0482956b5c35f98eb7' 
  AND token = 'Yw6ZR2is6zWI34uJlE5ZX8iMEnSLLsILHm1CwfcsSlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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