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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b03127b8bc606457d0beaa356bdf3b0b3648239b093cf871d5cd0a48dc328e' 
  AND token = 'zK0oVZsyyzHMb6B9JRWR26A6b/HtZ9XJtua6rQV4TzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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