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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f15092847f28fa6d65656f2947f3632bf7cfa90b717cd936d1d762ee6f8048b' 
  AND token = '+ROZiZns4BzKV3yAXa0o/z7x/4iKyH6YG667n98H53Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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