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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b57208631ca2025c9e9d24ed247dac33e4df64ed7d3043694c7f7011c2a93d2' 
  AND token = 'lGwHncpDRtbMnEKFBAPPvBznyF6dOSOFn1m/LQGgzcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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