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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fc4fc90990843535d8854dc5bfad813df202302a7bad979a75c4576a69dc0c' 
  AND token = 'LJKDT3s1dcCU/MULxYzWUISkZKfMk/NipZPuUBcFdBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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