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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14eec60a616eabc59fbf53842806b465b3b7637f6de9d5dc259aebd0c89b972e' 
  AND token = 'nojpjTDuDtJTjoWgdZ8pxqK/gGtyt381yvc1uuhknuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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