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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1265f6d91f26fbbb40eb0d3f90f90843f16878d6a97276b437d9883a57f574c' 
  AND token = '/p4YzsjF0Ufxl7X27I0MdkR5Y2TcknNX9lTTSzL3B7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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