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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4c97530d0d29b8f2a83a09b54814d50a419a2e8b42762421c2e6f535d57d0a' 
  AND token = 'c/H6FQ4xwCbm9y1/ucjhMrJryYO0wQoP1riAgI3iCgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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