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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93a5a02249b3e967c02dfaecdc5ad5afd0aec7edc6bb139f2c62bdf4be62291' 
  AND token = 'n08n8MUO2J7GcBCVUUb3K6BOIzr7bLHMjeQkytOXdAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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