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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91be1a4d45b4d1e1d0c6b8a74a893b52d52f844aa2e1c4bbfc4e2cfe2e189c1' 
  AND token = '4GJISxh97Vik8Nwzyw7WFHyFx9hzL/G3DBinOw6ny48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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