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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f37571122146b5cf0076a168a41d84d82dcd0419d3a0cef83189c3a992f637' 
  AND token = 'MTy18DJT5U3Lb0/NBHLDmeVb2mA2Spm0oZOt1B14k6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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