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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d46dfb0dd02d3a135da113ae509d09b0b441011f0f42fcbc7648659a2c8343' 
  AND token = 'LcPqIx9YbUowwok8WAanT+TR4jZeJn41snaov6tlXBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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