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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a8ea4a73620e7a7d5ce7f458bd0c0ca5e451278d81c316bc48dac6e7d1ea22' 
  AND token = 'DhwYUWGhi7Lc0TLrD5AYl4FlKg+2zm+9VFrM5lIBYek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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