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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afc1c18d70b3f05f5703682bad6fc3c69f40494681661fa56665ced736f9062' 
  AND token = 'xZu+zbhaGpRP7Hf7bftPl48Bx1W0/4bTNUm0WXyvkyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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