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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012ed7f3ed0f8c05ca8d5ecc5a8ea2647c3e9133b3de31233c08b5a0719ff5cf' 
  AND token = 'AfMV8f31vDGMmr0BB1Y2rI1yLLS/aaBASqADPhd0eoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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