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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e93d48f55b8a83e8268a9867aa8127e7b653decf257d70f57f56db9b09f182' 
  AND token = 'Tp71n9tTRW8FVmK+fMP8RSP4Z4IhvJeKt201CFIkVB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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