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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010626c8a36e52393b958ebe52d45bed7f5d1bfb85d427d88efdc21587a16293' 
  AND token = 'KHNqFmsnw8zNFOIFITcDrWEYCKQ9Xdl+STk3wxFKkoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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