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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f52425659812809fece88b18bdc049a70de063358aa4b6cc14b1fa245555962' 
  AND token = 'Q0sd1hvf7Cs0N7PbI41nAZss466IOPEWpX7PTFCslfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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