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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7aaf494ede009a0391135c5988b80e5b58cfc882e92d8fa4b6a02db65b6d4a' 
  AND token = 'QnCS+UnHiTOW+q5x31/PCSgFIfaIbuItl9CqSEIbhSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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