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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970536421b35ca5cd8a1cf68df7f20f8fc9ee8d488cad0d8054b8721a9a052d7' 
  AND token = 'P68q2dlyvVA1j72oOqG65m+Jz35+G7aaZsxGJsZY9CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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