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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424fa6d7ee6306154a3cb46ecff910efccee94c990a8e5777bbc647d003e06d6' 
  AND token = 'bkblOJKj0ckccw5eUxYCAjzfhk9aheUn4SBcfe57/kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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