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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352e50e06da39af7ee281bc888038e8912e8d825688ee2b1e344619c488ce8cc' 
  AND token = 'OC8rvuQVNi1RQmsoksBgpbSI6l0n2auKhIXyovhZtP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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