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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bfca855c0c0ff9aa21b2c33793ec1741a1569722efe95c69040aa78f3649393' 
  AND token = '8woTIScsz35zNj1vFF7f1T5g3rrOwXGGr4R0SRgvzIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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