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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede25ae495c47f650cd470a5229aded0e7fb152c3aa2a1c2ab7304b5ef8795d4' 
  AND token = 'NKGlreW7uC24F57MeMzKTRoQMYzvO7Dj/SwrL9Oyrbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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