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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d9347688540a1b0d3ccd7a9129826fcbd7fb44bb53f03d92cf9ccf813651aa' 
  AND token = 'mI6Be0R9UyWuLQI2HgNcCcINrWB3+rbLyk1+m3dGeXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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