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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4c92c915d90a23c6b3674a73c1f3d2274c91edd9ef7e05b1b99b0d473d6b6b' 
  AND token = '7tTOxjP4D2E+RQIK3cX+Yy6pdLuqrIqwWc7J1PKFgd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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