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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8ded73871a2b06c1ae8084339d349081e710e60e2332e86f01e258cf8afe98' 
  AND token = 'Hm4fuVulnH+8IBC+gOJfYnjA0q7/7Wr4V9l85oHKy9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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