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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dafada46be99f967f8e52c292c9c87e5bc123d923fa779262a39f0635e8643c' 
  AND token = 'ZmfNP/f8ycS53SBJ6GXOemu04YdurX03gXYXcX2/ecU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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