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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418f60d95126cc92ecb794c1343b060a8a9f32a102b9ff6df26b94772af5d1ef' 
  AND token = 'cG8KCgTCCq9dDWsmqzlULLCd25q9xwkPQC5AJp1hRPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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