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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0d11cf4303de302b0388d5f8c5665b64c955afd7ced8740fa667aa04725e98' 
  AND token = 'NSp/m9YTgzP/OX3J0vZ+B/AEzPPS5s7dr5UF2t7CSoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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