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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba90f3df5470afc8b18478f8aa672e44670fae862754b8deb49a737addc4bd7' 
  AND token = 'kSgxR3iZgFDE+y6aSGwKKpSGZS9b0jeiUx8HL+39als=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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