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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804b1fed8fba98787171f54576c85a7bc385c867743a74215dba4312043b8b1d' 
  AND token = '1YKCUaN8H36+S1sqRJm9by4pMZpHygzg1IxWQzhsobg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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