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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1197b545478c407e5795575b4ddc29ff462fb87c1c3d9f35bd794170043eaedc' 
  AND token = 'XkyhqSK+bieeJ4g1wbM3qkANOS1gBY1Nt2nFVzE21gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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