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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f18717f96e6175bdab7172fd5e6b324e0264b24eafe5e413ef06c8d370c047' 
  AND token = '8wH+xYlebPtVYf9/dyeY1QKPUKIn6odDjxH6Ao58b3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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