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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2815cb27f3f38fe84222891e8e1fe97172f11a136f0b42bc27562eb6037908d8' 
  AND token = 'mopI9jDXwWoODfskLOw7OC/X3JQFMghiDGoCs0N4ndE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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