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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cd62f282eb51d5d0e788935bd2999ae89f763a5bbb45a5da748939a59272f5' 
  AND token = 'tmLFfp+EMAJZ8baENexYdseTGgWyd7s4KGFLcZDIr9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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