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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c02624abbc435b1229fff332418951f2697f804670b4198f711f6ec2d3762b' 
  AND token = 'HPQbVocSUQqvqHo5vT6y0GHUJ9ys6nLdcalUiepjdWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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