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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04510f39fa86f3e715b457a702f75440a97f5faab41db52ad178abf514b6e5a9' 
  AND token = 'c41v5RCGvNL4TzG/T6cn1tLsTlQgnDalj+DRri0lj3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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