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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdddb8da94018a5e3aa6a8ada8cd005de35754b5eeae00fe02b315572d80083' 
  AND token = 'hzlS2fIheb5f3r/zoIQJ4SRoIyxq7ARbwUimS7rJvRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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