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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba99a55dabdfe4c2e6794e0eb737c8dba652080f061503aa3ca0053fd6d3b836' 
  AND token = '6aTYmw6K0FB6xB+gUmvYzhKsKjzWO6ov02z4YFWMO9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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