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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7562da7d23eef2a157c1b52dc574ecd94dfcd85260ae16c1dfd43906c4fb621' 
  AND token = 'D7rFwE2X9VT/VCy56Ty5uaa4CnUGrePgtpYMyUe3i4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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