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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e3fadd1e5c5433233493a4b4403fdf8984f50d2912cf1b32eb5ddcf7b15231' 
  AND token = 'v5e6MPtlgAd1grrGrhl4L4iFOHU2y+kg37TMKHplIxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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