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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97b9b0b576907d588140452f171ce2e8b1c9b960011af275762df243ac4ba6e' 
  AND token = 'fl+1prOxGdJA84gT6I775P5fF1IATZMG1i9rw4bU9sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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