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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090cd982c3fedca00913cab35118b48a67961a7c7d8310c7b8031c2e5f5f387b' 
  AND token = 'uUk5XdnfZ0T3N9mez3AbS0zZik9jIGMfD5ZhyuY5aok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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