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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4cf446fd384f26c1b5ad00824b8a65358090dd534e23c3c56e4aa078bb0084' 
  AND token = 'PNtP+SKJ43MKT5pBCBjfTl9CGp6SymR5T8jdf4rtV7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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