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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db329a4b2ca80de7a4bf0763221f3a3ca2ec8c6dda84cac1ad19860808d5d5e1' 
  AND token = 'Emcnz5PVIIg+DL2gfaemLiw6cLVWlObYlA5QkJTHbWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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