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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c027b93b612b39732ca0e0a41e33d951c7ab0fdb87f946725ae607fd25c82ec4' 
  AND token = 'I1cXHkmGwcOa3/E6JHAmOzRAJK05H1L90H37uDoCgmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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