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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85b0e0897d5800fa925f355b050d6d021c91dab5b324f69c4dee18e8cedb7cd' 
  AND token = 'Rskzpb5vfmjfUfM/t+SlwXzSY6peuRP4MoG9guMvDck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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