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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77617c9716bc2e8e2df3b038d78ce663cdf21a547241a0818f02e5c87d5008ce' 
  AND token = 'puXUvHrp4U6bY8R4CmU+DslyA8JYKAvL39egFcYQ4I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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