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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496b615b434a67868da2137675e2134ec031c06f4a677e7b46dc7c74596e5e03' 
  AND token = '7kimoZQomKtd7ZDu1EPJ54OnKV+itrkIlNPy9EyHHr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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