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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aca0641fa381176a63efdd8bf0450637af3e854e3b0a09fbb9c7aa59ede230c' 
  AND token = 'F5MjCYbAT+7zFJxIfYPZer75a2uiltq5q1vllu6U+94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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