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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09108c5fdbaabe110c8254b065da9686e9861c30205b005462d0175eb062eab' 
  AND token = 'bU4+N1iR/mKU0D0uyWDQDdL+YXnSEvIV0NCBbl+aF8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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