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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2ca1b349e3ed87d73cd7167c9bed9774e81ff2a7f02b7aa63170cbc8e0a72a' 
  AND token = '7EHQs1qb5f+p9yNnyqBxL9G40d5HZ5kCed1yWJf1hdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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