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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be80d3a95f8458fb97ac26fe2787ccb2d7a40c7fcf6582c8de4d506071658e7e' 
  AND token = 'hgtineCH6gfrE1GAdYIuB6euSy2xhs6grbFaomeqyyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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