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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae1402bab05fe8797a866b40b6d182d089cb0f542e2d552346d45c3e46f8a52' 
  AND token = 'iHgolqcMWKEEY6+C4kNm8ceShYErs9/h01nGWXB8ah8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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