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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5351003dd7b0e5c616efb3af97e5ce605050f26eef64f93bc22a33599952303' 
  AND token = 'YiH/HuAkRIsMz1B5ACtMsMb2ThhiSk5+G7SxAmE0G74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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